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Screening of a library of T7 phage-displayed peptides identifies alphaC helix in 14-3-3 protein as a CBP501-binding

Yuki Matsumoto1, Yosuke Shindo, Yoichi Takakusagi

  • 1Department of Applied Biological Sciences, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.

Bioorganic & Medicinal Chemistry
|October 29, 2011
PubMed

Insights

CBP501, a peptide drug, binds to 14-3-3 proteins via their alphaC helix. This interaction complements its Chk kinase inhibition, impacting cell cycle arrest.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • CBP501 is a modified peptide that inhibits Chk kinase and DNA-damage-induced G2 arrest.
  • 14-3-3 proteins are crucial regulators of cellular processes.
  • Understanding CBP501's molecular targets is key to its therapeutic potential.

Purpose of the Study:

  • To identify the specific binding site of CBP501 on 14-3-3 proteins.
  • To investigate the interaction between CBP501 and different 14-3-3 isoforms.
  • To elucidate the mechanism of CBP501's action beyond Chk kinase inhibition.

Main Methods:

  • T7 phage display technology for identifying binding partners.
  • Affinity selection using biotinylated CBP501.
  • Surface plasmon resonance (SPR) and ELISA for interaction analysis.
  • Avidin-agarose bead pull-down assays for isoform binding.

Main Results:

  • An alphaC helix region of 14-3-3 proteins was identified as the CBP501-binding site.
  • CBP501 specifically interacts with 14-3-3ε and other 14-3-3 isoforms.
  • CBP501 demonstrated the highest affinity for 14-3-3ε among tested Chk kinase inhibitors.

Conclusions:

  • CBP501 directly binds to the alphaC helix of cellular 14-3-3 proteins.
  • This direct binding to 14-3-3 proteins is a novel mechanism of action for CBP501.
  • CBP501's dual action involves Chk kinase inhibition and 14-3-3 protein interaction.

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